merge: v4l-dvb

1 files changed, 21 insertions, 4 deletions

diff --git a/linux/drivers/media/video/bw-qcam.c b/linux/drivers/media/video/bw-qcam.c
index 393113875..ca8fabdf3 100644
--- a/linux/drivers/media/video/bw-qcam.c
+++ b/linux/drivers/media/video/bw-qcam.c
@@ -895,10 +895,27 @@ static ssize_t qcam_read(struct file *file, char __user *buf,
 	return len;
 }
 
+static int qcam_exclusive_open(struct inode *inode, struct file *file)
+{
+	struct video_device *dev = video_devdata(file);
+	struct qcam_device *qcam = (struct qcam_device *)dev;
+
+	return test_and_set_bit(0, &qcam->in_use) ? -EBUSY : 0;
+}
+
+static int qcam_exclusive_release(struct inode *inode, struct file *file)
+{
+	struct video_device *dev = video_devdata(file);
+	struct qcam_device *qcam = (struct qcam_device *)dev;
+
+	clear_bit(0, &qcam->in_use);
+	return 0;
+}
+
 static const struct file_operations qcam_fops = {
 	.owner		= THIS_MODULE,
-	.open           = video_exclusive_open,
-	.release        = video_exclusive_release,
+	.open           = qcam_exclusive_open,
+	.release        = qcam_exclusive_release,
 	.ioctl          = qcam_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= v4l_compat_ioctl32,
@@ -910,6 +927,7 @@ static struct video_device qcam_template=
 {
 	.name		= "Connectix Quickcam",
 	.fops           = &qcam_fops,
+	.release 	= video_device_release_empty,
 };
 
 #define MAX_CAMS 4
@@ -947,8 +965,7 @@ static int init_bwqcam(struct parport *port)
 
 	printk(KERN_INFO "Connectix Quickcam on %s\n", qcam->pport->name);
 
-	if(video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1)
-	{
+	if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) {
 		parport_unregister_device(qcam->pdev);
 		kfree(qcam);
 		return -ENODEV;